\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}% MathType!MTEF!2!1!+-
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% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
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% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x
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% iEaiabgIGiolabl2riHkabg2GiNiaadIhadaahaaWcbeqaaiaaikda
% aaGccqGH9aqpcaaI0aaaaa!3F49!
\[
\exists x \in \mathbb{R} \mathrel\backepsilon  x^2  = 4
\]
\end{equation*}
\end{document}
